I'm not sure it is possible; it would of course be possible to share the internet connection but what a Router does is very much different; what you're saying is to turn it into a Server that organises the internet and I don't think Windows 98 could do that without all the other PCs being on Windows 98.
A Knight is sworn to Honour. His heart knows only Virtue. His blade defends the helpless. His might upholds the Weak. His word speaks only truth. His wrath undoes the Wicked.